<template>
  <el-container class="home-container">
    <!-- 头部区域 -->
    <el-header>
      <div>
        <img src="../assets/img/heima.png" alt="" />
        <span>电商后台管理系统</span>
      </div>
      <el-button type="info" @click="logout">退出</el-button></el-header>
    <!-- 页面主体区域 -->
    <el-container>
      <!-- 侧边栏 -->
      <el-aside :width="isCollapse ? '64px' : '200px' ">
        <div class="toggle-button" @click="toggleCollopse"> ||| </div>
        <!-- 侧边栏菜单区域 -->
        <!-- active-text-color 当前激活菜单的文字颜色 :unique-opened 是否只保持一个子菜单的展开 :collapse 是否水平折叠收起菜单 
        collapse-transition 是否开启折叠动画 router 使用 vue-router 的模式，启用该模式会在激活导航时以 index 作为 path 进行路由跳转 -->
        <el-menu background-color="#333744" text-color="#fff" active-text-color="#409eff" :unique-opened="true" 
        :collapse="isCollapse" :collapse-transition="false" :router="true" :default-active="activePath">
          <!-- 一级菜单 -->
          <el-submenu :index="item.id + '' " v-for="item in menulist" :key="item.id">
            <!-- 一级菜单的模版区 -->
            <template slot="title">
              <!-- 图标 -->
              <i :class="iconsObj[item.id]"></i>
              <!-- 文本 -->
              <span>{{item.authName}}</span>
            </template>
            <!-- 二级菜单 -->
            <el-menu-item :index="'/' + subItem.path" v-for="subItem in item.children" :key="subItem.id" 
            @click="savaNavState('/' + subItem.path)">
              <template slot="title">
              <!-- 图标 -->
              <i class="el-icon-menu"></i>
              <!-- 文本 -->
              <span>{{subItem.authName}}</span>
              </template>
            </el-menu-item>
          </el-submenu> 
        </el-menu>
      </el-aside>
      <!-- 右侧内容主体 -->
      <el-main>
        <!-- 路由占位符 -->
        <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
</template>
<script>
export default {
  data(){
    return{
      //左侧菜单数据
      menulist:[],
      //一级目录字体图标
      iconsObj:{
        '125':'iconfont icon-user',
        '103':'iconfont icon-tijikongjian',
        '101':'iconfont icon-shangpin',
        '102':'iconfont icon-danju',
        '145':'iconfont icon-baobiao',
      },
      // 是否折叠
      isCollapse:false,
      //被激活的链接地址
      activePath:''
    }
  },
  created(){
    this.getMenuList(),
    this.activePath = window.sessionStorage.getItem('activePath')
  },
  methods: {
    logout() {
      window.sessionStorage.clear();
      this.$router.push("/login");
    },
    //获取所有的菜单
    async getMenuList(){
      const {data:res} = await this.$http.get('menus')
      // console.log(res);
      if(res.meta.status !==200){ return this.$message.error(res.meta.msg)}
      this.menulist = res.data
    },
    //点击按钮，切换菜单的折叠与展开
    toggleCollopse(){
      this.isCollapse = !this.isCollapse
    },
    //保存链接的激活状态
    savaNavState(activePath){
      window.sessionStorage.setItem('activePath',activePath)
      this.activePath=activePath
    }
  },
};
</script>
<style lang="less" scoped>
.home-container {
  height: 100%;
}

.el-header {
  background-color: #373d41;
  display: flex;
  justify-content: space-between;
  padding-left: 0;
  align-items: center;
  color: #fff;
  font-size: 20px;
  > div {
    display: flex;
    align-items: center;
    span {
      margin-left: 15px;
    }
  }
}

.el-aside {
  background-color: #333744;
  .el-menu{
    border-right: 0;
  }
}

.el-main {
  background-color: #eaedf1;
}

.iconfont{
  margin-right: 10px;
}

.toggle-button{
  background-color: #4a5064;
  font-size: 10px;
  line-height: 24px;
  color: #fff;
  text-align: center;
  letter-spacing: 0.2em;
  cursor: pointer;
}

</style>